Disrupting MLC1 and GlialCAM and ClC-2interactions in leukodystrophy entails glial chloridechannel dysfunction

Defects in the astrocytic membrane protein MLC1, the adhesion molecule GlialCAM or the chloride channel ClC-2 underlie human leukoencephalopathies. Whereas GlialCAM binds ClC-2 and MLC1, and modifies ClC-2 currents in vitro, no functional connections between MLC1 and ClC-2 are known. Here we investi...

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Detalles Bibliográficos
Autores: Hoegg-Beiler, Maja B., Sirisi Dolcet, Sònia, Orozco, Ian J., Ferrer, Isidro (Ferrer Abizanda), Hohensee, Svea, Auberson, Muriel, Gödde, Kathrin, Vilches, Clara, López de Heredia, Miguel, Nunes Martínez, Virginia, Estévez Povedano, Raúl, Jentsch, Thomas J.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2014
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/129370
Acceso en línea:https://hdl.handle.net/2445/129370
Access Level:acceso abierto
Palabra clave:Malalties cerebrals
Teixit nerviós
Metabolisme cel·lular
Proteïnes de membrana
Canals de clorur
Brain diseases
Nerve tissue
Cell metabolism
Membrane proteins
Chloride channels
Descripción
Sumario:Defects in the astrocytic membrane protein MLC1, the adhesion molecule GlialCAM or the chloride channel ClC-2 underlie human leukoencephalopathies. Whereas GlialCAM binds ClC-2 and MLC1, and modifies ClC-2 currents in vitro, no functional connections between MLC1 and ClC-2 are known. Here we investigate this by generating loss-of-function Glialcam and Mlc1 mouse models manifesting myelin vacuolization. We find that ClC-2 is unnecessary for MLC1 and GlialCAM localization in brain, whereas GlialCAM is important for targeting MLC1 and ClC-2 to specialized glial domains in vivo and for modifying ClC-2's biophysical properties specifically in oligodendrocytes (OLs), the cells chiefly affected by vacuolization. Unexpectedly, MLC1 is crucial for proper localization of GlialCAM and ClC-2, and for changing ClC-2 currents. Our data unmask an unforeseen functional relationship between MLC1 and ClC-2 in vivo, which is probably mediated by GlialCAM, and suggest that ClC-2 participates in the pathogenesis of megalencephalic leukoencephalopathy with subcortical cysts.

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